Trump said tariffy things today (Friday afternoon) and global markets are in turmoil.
It looked like a classic planned whale dump to me; causing a call on derivative accounts which then cascaded. The sudden sell of the called accounts caused a price drop which scared those with cabbage hands. There has been steady whale sell off for a number of weeks keeping the price pretty level against the treasury company buys. That would have given the whale(s) liquidity to buy back in once they caused the price drop.
Just my take anyway. We've heard so much of Trumps tariffy blusters one must wonder if anyone listens any more.